Automatic door and lock for elevators



. (No Model.)

A. PONTIUS. AUTOMATIC DOOR AND LOOK FOR ELEVATORS.

No. 445,433. Patented Jan. 2'7, 18914.

INVEN'IQR $15M WWW WITNESSES UNITED STATES PATENT OFFICE.

ANDREW PONTIUS, OF CINCINNATI, OHIO.

AUTOMATIC DOOR AND LOCK FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 445,433, dated January 27, 1891. Application tiled September 26, 1890. Serial No. 366,231. (No model.)

To all whom it may concern:

Be it known that I, ANDREW PONTIUS, of Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and useful Improvement in Automatic Doors and Looks for Elevators, which improvement is fully set forth in the following specification and accompanying drawings, in which Figure 1 is an interior elevation of an elevator-shaft provided with my improved doors and locks; Fig. 2, a detail view of the lock or latch, and Fig. 3 a detail view of the lever in position to trip the latch as the elevator ascends.

My invention relates to improvements in safety appliances for elevators; and its object is to providea simple, economical, and reliable device whereby the doorways are automaticall y opened and closed by the vertical movement of the car as-it passes up or down the shaft, sothat passengers cannot enter or leave the car until it is stopped at the proper position at a landing-place.

The invention consists in providing the inner faces of the doors with grooved cleats or guides which extend diagonally across from side to side thereof. A stud attached to the frame of the car engages the guides, and the doors are drawn from side to side of the doorway in succession as the car ascends or descends. The doors are also looked and unlocked at the proper time by the same means.

Referring to the accompanying drawings, A designates a door provided with rollers above and below. A grooved eleat or guide I) is bolted to the door and extends diagonally across the same from. the upper and lower corners on one side to a central point on the opposite side. A latch (I, made of a thin strip of metal, is pivoted to the door and is controlled by bell-crank levers e and retractingspringsf. The outer ends of the said levers extend into the upper and lower ends of the guide. A stud g, having a friction-roller, is bolted to the central stanchion 0f the car.

The operation of the device will be readily understood. The car being at the lower floor of the building, as shown in Fig. 1, the door is necessarily open. When the car ascends, the stud engages the guide-track, closes the door gradually, and fastens the latch. Approaching the opening into the second story the stud g strikes the end of the lever on that door, releasing the latch, and the door is gradually drawn aside by the upward movement of the car.

It will be observed that the relative positions of the stud and the guide-track are so arranged that when the platform or floor of the car reaches a landing the dooris entirely open and begins to close whenever the car resumes its progress. It will also be seen that the opening and closing process is repeated when the car descends.

hat I claim as new is- A laterally-movable elevator gate or door having zigzag guideways and a springactuated latch connected to bell'crank levers projecting into said guideway, in combination with a stud projecting from the car-frame into said guideway and engaging said cranklevers, substantially as and for the purposes set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 23d day of September, 1890, in the presence of witnesses.

ANDREW PONTIUS.

Witnesses:

Wu. H. PUGH, E. POTTER DUSTIN. 

